Janitor Troubles
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4
janitortroubles.py
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4
janitortroubles.py
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a, b, c, d = map(int, input().split())
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s = (a + b + c + d) / 2
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k = ((s - a) * (s - b) * (s - c) * (s - d)) ** 0.5
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print(k)
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